Battlefield 2042 lag and low fps icon

Hi, I hope somebody can help me, I am playing BF 2042 now again since a couple of days. And I have played over 1700hrs in this game, but now its allmost impossible to play for me. My Pc is the same as when I started playing this game, so no hardware changes since. i run a pc with i7 9700KF and a RTX 2070 Super. RAM in the pc is 16Gb. Playing the game the temp of the CPU runs steady between 60 and 70 degrees celcius as does my GPU arround 60 degrees celcius. The problem starts when loading into a server which takes like forever now. Lag lag and lag, when I am in the server i don't see my gun, which will appear after I died the first time. But then the lag is not normal the sound dissapears now and then and the Low FPS sign pops up now and then. i cannot play a full round, halfway the round the game crashes and I am back to my desktop. So... I am clueless. does anyone have some advice of what to do/ change?